- Radio & Television Repair Shops , Guilford - TV Repair
- Radio Communications Equipment & Systems , Guilford
- Radiologists, Guilford - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Guilford - X-Ray Equipment & Supplies
- Radiotelephone Communications, Guilford
- Real Estate, Guilford - Agent, Broker & Companies
- Real Estate Agencies, Guilford
- Real Estate Agent & Broker Services, Guilford
- Real Estate Agent - Property Lessors, Guilford
- Real Estate Appraiser, Guilford - Appraisal Services
- Real Estate Appraisers & Consulting Services, Guilford
- Real Estate Broker, Guilford
- Real Estate Consultants, Guilford
- Real Estate Management, Guilford
- Real Estate Services, Guilford
- Record Storage, Destruction & Management, Guilford
- Recreational Organizations, Guilford
- Recycling Drop-Off Centers, Guilford
- Reducing Exercise & Weight Control Services, Guilford
- Refrigeration & Cooling Equipment, Parts & Supplies , Guilford - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Guilford - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Guilford - Fridge
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- Rehabilitation Centers, Products & Services, Guilford
- Rehabilitation Specialists, Guilford
- Religious Organizations, Guilford
- Religious Services, Guilford
- Repair Services, Guilford
- Research & Development Bureaus, Guilford - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Guilford - Laboratories
- Research Services, Guilford
- Residential, Guilford
- Residential Apartments, Guilford
- Residential Care Facilities, Guilford
- Residential Construction Contractors, Guilford - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Guilford
- Restaurant Equipment & Supplies, Guilford
- Restaurants/Food & Dining, Guilford
- Resume Service, Guilford
- Retail Book Stores, Guilford
- Retirement Communities & Home, Assisted Living & Apartments, Guilford
- Riding & Rodeo Services, Guilford
- Roofing Consultants, Guilford - Roofing Companies
- Roofing Contractors, Guilford - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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